|Serious accidents caused by metal fatigue have happened to familiar things
such as a plane,train,bridge and roller coaster in the past.
Here are some examples shown below.
The world's first English plane COMET was broken up in midair because
of fatigue destruction at the corner of the plane window.
Seongsu Bridge in Korea collapsed suddenly, which was because fatigue
fracture proceeded rapidly due to welding deficiency and traffic increase.
the German high speed train ICE was derailed due to fatigue fracture of
A roller coaster of an amusement park in Osaka Japan was derailed due
to fatigue fracture of an axle.
An research of metal fatigue has being developed so that such kind of accidents
shound never happen.
Then, what do you think is needed to prevent those accidents above?
It is reliable and safety design.
And, what is needed to have such design is FATIGUE STRENGTH !!
And more , it is the best way to use a Fatigue Testing Machine to find
out fatigue strength.
Isn't it high time to see once again if Fatigue Strength data which is
a basis of safety design is certain enough or not?